Anisotropy of Third-order Structure Functions in MHD Turbulence

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F15%3A00445263" target="_blank" >RIV/67985815:_____/15:00445263 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1088/0004-637X/804/2/119" target="_blank" >http://dx.doi.org/10.1088/0004-637X/804/2/119</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/0004-637X/804/2/119" target="_blank" >10.1088/0004-637X/804/2/119</a>

Result language

angličtina

Original language name

Anisotropy of Third-order Structure Functions in MHD Turbulence

Original language description

We use direct numerical simulations (DNSs) of magnetohydrodynamic (MHD) turbulence to characterize the anisotropy of Y. We find that for strong guide field B-0 = 5 the degree of two-dimensionalization depends on the relative importance of shear-Alfven and pseudo-Alfven polarizations (the two components of an Alfven mode in incompressible MHD). The anisotropy also shows up in the inertial range. The more Y is 2D, the more the inertial range extent differs along parallel and perpendicular directions. We finally test the two methods employed in observations and find that the so-obtained cascade rate may depend on the angle between B-0 and the direction of increments. Both methods yield a vanishing cascade rate along the parallel direction, contrary to observations, suggesting a weaker anisotropy of solar wind turbulence compared to our DNSs. This could be due to a weaker mean field and/or to solar wind expansion.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BN - Astronomy and celestial mechanics, astrophysics

OECD FORD branch

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Project

<a href="/en/project/GAP209%2F12%2F2023" target="_blank" >GAP209/12/2023: Ion thermal energetics in the expanding solar wind</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2015

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astrophysical Journal

ISSN

0004-637X

e-ISSN

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Volume of the periodical

804

Issue of the periodical within the volume

2

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

"119/1"-"119/13"

UT code for WoS article

000354905000041

EID of the result in the Scopus database

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